Boiler or heater



Aug. 13, 1929.

T. E. MURRAY ET AL BOILER OR HEATER Filed March 19, 1924 2 Sheets-Sheet 1 INI/ENTQRS l p by, T

TORNE Y Patented Aug. 13, 1929.

UNITED STATES PATENT oFFlc'E.

THOMAS E. MURRAY, OF BROOKLYN, AND JOHN H. LAWRENCE, F NEW YORK, N. Y.; SAID `.LAVUENCIEl ASSIGNOR OF HIS ENTIRE RIGHT T0 SAID MURRAY.

BOILER OR HEATER.

Application filed March 19, 1924. Serial No. 700,215.

Our invention aims to provide improvements in the direction of cheapness and etlioiency in boilers, water heaters and heaters generally. The accompanying drawings illustrate embodiments of the invention.

Fig. 1 is a vertical section on a plane from "front to back of a heater;

Fig. 2 is a partial section and a partial elevation of the same from the rear;

Fig. 3 is a plan of the same;

Fig. 4 is a section similar to Fig. 1, illustrating a modification.

Referring to the embodiments of the invention illustrated, the wall or outer shell 1 l5 of the heater is a length of comparatively thin pipe, such as can be made by bending a thin sheet of metal and joining the edges by Welding or otherwise. An inner wall 2 is made of a similar pipe `of smaller diameter with flared ends which are welded to the outer shell 1. This forms a water jacket or space 3 which is supplied with water from a pipe 4 and overflows or passes out through a pipe 5. A drainage pipe with a cock 6 serves for emptyingthe water space. The water may be circulated from the pipe 5 through v radiators andv back to the inlet pipe 4.

Located within the chamber 7 formed by the inner shell 2 is a radiant body 8 adapted to become highly heated and to radiate its heat directly against the inner wall 2. It may be of various materials, such as for eX- ample fire clay. It is supported by means :is of inclined shoulders 9 at its upper ends resting upon the iared upper portion 10 of the inner wall 3. It is of long narrow shape in plan and slightly wedge-shaped in vertical section, and the lower portion of it has the edges well spaced away from the wall 3 so as to offer no hindrance to the dropping of coal `past it. It may, however, be of various shapes and materials according to the design and intended use oi" the heater. Such a l5 radiant body becomes highly heated and has a considerable surface from which the heat is radiated to the side walls with much greater efficiency than if the walls' were eX-j posed only .to the hot gases from the lire.

The top 11 is of sheet metal flanged to iit over the side wall, with an opening surrounded bya flange/F12 to receive the smoke pipe 13. 'It is prov;(ded also with a central opening covered by a hinged 'door 14 lined with fire brick or similar refractory material, for introducing coal. By` opening this door also access is had to the radiant body and it is loosely supported so that it may be adjusted to the best position. l/Vhen the radiant body requires t0 be replaced by a new one, the top 11 may be lifted on? for the purpose.

' The apparatus is shown with a coal burner, though various other means may be'used for supplying heat. The body of coal 15V rests on rocking grate bars 16. The outer wall 1 has a downward extension 17 within which is mounted 'a flanged ring 18 support-l ing the grate bars, from which depends a conical chute or guide 19 which directs the cinders and ashes into a pan 2O removable through a side door. The side wall and the parts 18 and 19 may be welded together or riveted. The lower endof the wall is closed by a flanged sheet metal bottom 21.

To facilitate combustion we preferably provide a ring 22 of fire brick or iron or other suitable material which surrounds the coal bed and is spaced away from the side wall, forming an annular chamber to which air is admitted through openings 23 in the outer wall and from which it passes under and through the coal bed. The wall 22 becomes h .eated by its contact with the burning coal and in turn heats the air supply. At the same time this protects the outer sheet metal wall from overheating, which would happen if it were in directcontact with the coal.

In Fig. 4 we have illustrated an additional lneans of preheating the air.' Surrounding' the lower part of the smoke pipe 13 is an air pipe 24 open at the top and communicating by a pipe 25, containing a damper 26, with the space belowthe grate. Otherwise the 95 design is the same as in Fig. 1. The ring 22 surrounding the fire bed is retained for protection of the wall 17 and may also be provided with openings 23 for admission of air.

The heater may be used as aboiler, that is for converting the water in the space 3 .into steam, by properly proportioning the parts and regulating the feed. Or it may 1 merely heating the water as described, .or for heating airA or 4#other uid passing through the space 3. Y

Though we have described with great particularity of detail certain embodiments of our invention yet it is not to be understood 1.10

therefrom that the invention is restricted to the particular embodiments disclosed. Va` rious other modications may be made in the structure of the heater, the radiant body and the burner and in the arrangement of the part-s without departing from the invention as defined in the following claims.

What we claim is i l. A heater comprising two tubular parts one within and spaced from the other to form an annular vessel, a combustion chamber within the inner one of said tubular parts and an opening at the top of said combustion chamber, a cover plate extending over said parts and a radiant body suspended from the top of saidparts and extending into said combustion chamber and adapted to be lifted out of the heater when said cover plate is removed, and a grate in the bottom of said combustion chamber, said radiant body being shaped to permit the passage of fuel past it to said grate when the cover plate is removed.

2. A heater comprising two tubular parts one within and spaced from the other. to form an annular vessel, and a combustlon chamber within the inner one of said tubular parts, a grate in the lower part of said combustion chamber, a cover plate extending over said parts and a radiant body suspended from the top of said parts and extending into said combustion chamber and adapted to be lifted out of the heater when said cover plate is removed, a ring surrounding the space immediately above the grate and spaced away from the side Wall, forming a chamber to which air is admitted and heated with an outlet labove the grate.

In witness whereof, we have hereunto signed our names.

THOMAS E. MURRAY.

JCI-IN H. LAWRENCE. 

